Metal ring for pulverizing or grinding mills.



PATENTED APR. 9, 1907.

, J. W. FULLER, JR. METAL "RING FOR PULVERIZING 0 APPLICATION FILED JAN.26, 1906.

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1 Io849,'781. L Y L PATENTED APR.'9, 1907.

J. W. FULLER, JR.

v METAL RING FOR PULVERIZING 0R GRINDING MILLS.

APPLICATION FILED JAN. 26. 1906.

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JAMES W. FULLER, J R., OF CATASAUQUA, PENNSYLVANIA.

METAL RING FOR PULVERIZING OR GRINDING MILLS.

Specification of Letters Patent.

Patented April 9, 1907.

Application filed January 26, 1906. Serial No, 297,930.

T0 at whom it may concern.-

Be it known that I, JAMEs W. FULLER, J11, a citizen of the UnitedStates, residing at Catasauqua, in the county of Lehigh and State ofPennsylvania, have invented certain new and useful Improvements in MetalRings for Pulverizing or Grinding Mills, of which the following is aspecification.

This invention relates to pulverizing or grinding mills, and moreparticularly to the metallic rings employed therein for forming thesurface upon which the roll or rollers op- It has been proposed toemploy metallic rings for this purpose having a working surface which isquadrantal in cross-section and is chilled excepting at the upper orsubstantially vertical portion of the quadrant to prevent uneven wear byspherical balls Working thereon.

The object of the present invention, however, is to provide a ring whichwill not crack when the wearing-surface is chilled, or afterward Whilein use, and according. thereto the ring is formed with the actualpulverizingsurface, which may be of any desired shape, wholly chilledand extending at both sides onto unchilled and non-pulverizing portionsof the ring.

Referring now to the accompanying drawings, in which is illustrated oneconvenient form and application of the improved ring, Figure 1illustrates, partly in top or plan view and partly in horizontal centralsection, the ring or annulus. Fig.2 illustrates in vertical centralsection the ring or annulus having a curved chilled central portionmerging into projecting unchilled portions; and Fig. 3 illustrates,partly in elevation and partly in vertical central section, apulverizing or grinding mill with a ring or annulus of my said inventionshown in application thereto.

Referring to the drawings, A represents a wide body-ring or annulus,substantially oblong in cross-section, and preferably of castiron. Thering or annulus is provided with a straight exterior surface a and fiatupper and lower surfaces a and a In the example shown the ring orannulus is provided with ribs a and a projecting from the surfaces a and(1 thereof and preferably integral with the ring or annulus A. Inaddition thereto the ring or annulus may be provided with locking-lugs aand a. The inner or wearing surface of the ring or annulus is dividedinto three portions, whereof the upper or lower portions 1) and b arestraight in outline, while I the intermediate portion 6 is curved orsubstantially semicircular in cross-section.

In'order to impart to the metal forming the inner surface differentdegrees of hardness or density, the intermediate surface 0 is subjectedto a chilling operation during the casting of the ring or annulus in amold. (Not shown.) In the mold are placed chilling means, consisting ofblocks or sections 0, of rhomboidal outline having an outwardlycurvedportion formed complementally in out line to that of the curved portionb of the formed ring or annulus A. These sections 0 are held in the moldin a position in which when the ring or annulus is cast the molten metalwill be brought into contact with the sections 0, and the contactingsurface of the metal about them will thus be chilled. Hence the metalforming the portion 6 of the ring or annulus A will be of greaterhardness or density than the portions 1) and b thereof which have beenleft unchilled in the formation or casting of the said ring or annulus-The process of chilling the ring or annulus shown and describedforms nopart of my present invention.

From the foregoing description it will be readily understood that a ringor annulus A is formed or cast, the inner surface of which is composedof metal of differing degrees of hardness or density that is, thatportion of the surface which is directly engaged by the crushing orpulverizing means is of a hard ness to readily resist and retard theexcessive wearing strain to which such surface is subjected. Theunchilled portions 1) and b merging into the chilled portion 1) beingnot directly engaged by the crushing or pulverizing means do not requireto be of the same degree of hardness or density as the intermediateportion b of the ring or annulus A. The surrounding of the chilledportion 5 by unchilled portions 5 and I) has proven to be beneficial inthe formation or casting of the ring. or annulus in that the same willprevent cracking, and thus formation of fissures therein, which takesplace when the whole of the inner surface is chilled. Furthermore, theunchilled portions 1) and b impart to the ring or annulus a greaterdegree of elasticity, which during expansion of the ring in use hasdemonstrated that cracking of the'chilled portions b is therebyprevented. The wearing-surface b of the ring or annulus instead of beingcurved, as shown and described, may be straight, so as to adapt such aring for use in various types of pulverizing or grinding mills.

One mode of application of the ring or annulus A is shown in Fig. 3 to apulverizing or grinding mill such as described in the specification ofmy concurrent application, Serial No. 297,929, filed January 26, 1906.In this type of mill balls (1 are employed, which by means of a carrier6 are held with one portion in contact with the chilled portion 5 of thering or annulus A.

Having thus described the nature and objects of my invention, what Iclaim as new, and desire to secure by Letters Patent, is

The combination, in a pulverizing or grinding mill, of a metal ring orannulus provided with a concave wholly chilled central portion andunchilled portions on both sides thereof and balls operatively arrangedand maintained in contact with the central portion only of said ring,and means adapted to prevent turning and displacement of said ring underthe action of said balls and materials acted upon thereby, substantiallyas and for the purposes described.

In testimony whereof I have hereunto set my signature in the presence oftwo subscribingwitnesses.

JAMES W FULLER, J R.

WVitnesses:

A. J. KAPP, FERD HEIMPEL.

